# Define here the models for your spider middleware
#
# See documentation in:
# https://docs.scrapy.org/en/latest/topics/spider-middleware.html
import random

from fake_useragent import UserAgent
from scrapy import signals

# useful for handling different item types with a single interface
from itemadapter import is_item, ItemAdapter


class QunarSpiderMiddleware:
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the spider middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_spider_input(self, response, spider):
        # Called for each response that goes through the spider
        # middleware and into the spider.

        # Should return None or raise an exception.
        return None

    def process_spider_output(self, response, result, spider):
        # Called with the results returned from the Spider, after
        # it has processed the response.

        # Must return an iterable of Request, or item objects.
        for i in result:
            yield i

    def process_spider_exception(self, response, exception, spider):
        # Called when a spider or process_spider_input() method
        # (from other spider middleware) raises an exception.

        # Should return either None or an iterable of Request or item objects.
        pass

    def process_start_requests(self, start_requests, spider):
        # Called with the start requests of the spider, and works
        # similarly to the process_spider_output() method, except
        # that it doesn’t have a response associated.

        # Must return only requests (not items).
        for r in start_requests:
            yield r

    def spider_opened(self, spider):
        spider.logger.info('Spider opened: %s' % spider.name)


class QunarDownloaderMiddleware:
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the downloader middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_request(self, request, spider):
        # Called for each request that goes through the downloader
        # middleware.

        # Must either:
        # - return None: continue processing this request
        # - or return a Response object
        # - or return a Request object
        # - or raise IgnoreRequest: process_exception() methods of
        #   installed downloader middleware will be called
        return None

    def process_response(self, request, response, spider):
        # Called with the response returned from the downloader.

        # Must either;
        # - return a Response object
        # - return a Request object
        # - or raise IgnoreRequest
        return response

    def process_exception(self, request, exception, spider):
        # Called when a download handler or a process_request()
        # (from other downloader middleware) raises an exception.

        # Must either:
        # - return None: continue processing this exception
        # - return a Response object: stops process_exception() chain
        # - return a Request object: stops process_exception() chain
        pass

    def spider_opened(self, spider):
        spider.logger.info('Spider opened: %s' % spider.name)


class UserAgentMiddleware(object):
    def process_request(self, request, spider):
        # print("<<<<<<<<<<<<<<",request.url)
        ua = UserAgent()  # 随机生成user-agent
        request.headers['User-Agent'] = ua.random
        # request.headers['User-Agent'] = "Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1"


class ProxyMiddleware(object):
    def process_request(self, request, spider):
        self.proxy = [
            "http://112.244.229.225:9000",
            "http://120.83.105.204:9999",
            "http://1.197.204.28:9999",
            "http://1.197.204.105:9999",
            "http://49.86.180.30:9999",
            "http://121.232.199.111:9000",
            "http://122.243.14.63:9000",
            "http://115.218.3.230:9000",
            "http://171.35.210.24:9999",
            "http://1.197.203.57:9999",
            "http://114.239.221.164:4236",
            # "http://176.12.125.241:8080",
            # "http://14.207.68.2:8080",
            # "http://103.28.37.131:3128",
            # "http://103.86.106.17:999",
            # "http://89.237.36.193:37647",
            # "http://103.204.220.18:83",
            # "http://113.121.241.131:8888",
            # "http://120.83.110.18:9999",
            # "http://190.89.40.5:999",
            # "http://37.60.18.242:3128",
            # "https://114.55.95.112:8999"
        ]

        request.meta['http_proxy'] = self.proxy[random.randint(0, len(self.proxy)) - 1]
        # request.meta['proxy'] = self.proxy[random.randint(0, len(self.proxy)) - 1]
        # proxy = "https://205.185.123.217:1080"
        # request.meta['http_proxy'] = proxy

    def process_response(self, request, response, spider):
        # 对返回的response处理
        # 如果返回的response状态不是200，重新生成当前request对象
        # if response.status != 200:
            # print(">>>>>>>>弃用ip：", request.meta['http_proxy'])
            # self.proxy.remove(request.meta['http_proxy'])
            # proxy = self.proxy[random.randint(0, len(self.proxy))-1]
            # print(">>>>>>>>启用ip：" + proxy)
            # # 对当前reque加上代理
            # request.meta['http_proxy'] = proxy
            # return request
        return response

    def process_exception(self, request, exception, spider):
        print(">>>>>>>>弃用ip：", request.meta['http_proxy'])
        self.proxy.remove(request.meta['http_proxy'])
        proxy = self.proxy[random.randint(0, len(self.proxy)) - 1]
        print(">>>>>>>>启用ip：" + proxy)
        # 对当前reque加上代理
        request.meta['http_proxy'] = proxy
        return request
